Purpose of laboratory testing in the context of hip fractures.

• A. To diagnose the fracture itself.
• B. To assess for complications and evaluate comorbidities.
• C. To measure blood flow to the hip.
• D. To determine bone density.

Answer: (B)

In hip fracture care, the main role of laboratory tests is to screen for and optimize comorbidities and perioperative risks, rather than to diagnose the fracture itself. Preoperative labs help identify anemia, electrolyte disturbances, renal and liver function, and bleeding risk, and they include type and screen or crossmatch for potential transfusion. These results guide anesthesia planning, medical optimization, and the timing of surgery, aiming to reduce complications and improve outcomes.

The other options don’t fit because the fracture is diagnosed primarily with imaging, not labs. Assessing blood flow to the hip isn’t a routine lab test, and would involve imaging if needed. Bone density testing evaluates osteoporosis and long-term fracture risk, not the acute management of an established fracture.